Chair frame



FIG. 1 is a front perspective view of a chair frame;

FIG. 2 is a slightly enlarged front elevation view of a chair frame;

FIG. 3 is a slightly enlarged rear elevation view of a chair frame;

FIG. 4 is a slightly enlarged side elevation view of a chair frame;

FIG. 5 is a slightly enlarged top plan view of a chair frame; and,

FIG. 6 is a slightly enlarged bottom plan view of a chair frame. 

We claim the ornamental design for a chair frame, as shown and described. 